Nonlinear Electromagnetic Properties of Thinfilm Nanocomposites (CoFeZr)x(MgF2)100−x

The aim of this work is a comprehensive study the effect variable atomic composition and structural-phase state (CoFeZr)x(MgF2)100−x nanocomposites (NCs) on their nonlinear electronic magnetic/magneto-optical properties. Micrometer-thick nanocomposite layers glass substrates were obtained by ion-beam sputtering composite target in argon atmosphere wide range compositions x = 9–51 at·%. value resistive percolation threshold, xper 34 at·%, determined from concentration dependencies electrical resistance NCs, coincides with beginning nucleation metallic nanocrystals CoFeZr MgF2 dielectric matrix. absolute maximum magnetoresistance NCs 2.4% magnetic field 5.5 kG at 25 up to threshold. Two maxima appear magneto-optical transversal Kerr effect, one which, corresponds formation alloy hexagonal structure, second 45 at·% phase transition cubic body-centered structure. threshold system xfm appearance hysteresis loop coercive force Hc ≈ 8 Oe, Concentration dependence showed that low contents < 30 are superparamagnetic (Hc 0). With an increase content, region thresholds, exhibit magnetically soft ferromagnetic character do not change it far beyond Oe.